I would like to continue to edit post one as a wiki,but I see no more edit options.
Brett Schnepf of Blurry Customs reply to an email of this question:
"The Dual DC Brushed the board itself is the same, you use the programming cable to connect it to a computer to "flash" the firmware, for example."
Which does seem to expand the potential further.
If the DC brushed motor control is basically a big dimmer chopper by pulse width modulation, then that mode should control light bulbs and the universal motors found in AC hand tools etc , and the motors found in rechargable type hand tools.
13.1 of the manual has blank notes in DCmotor control, while it does describe Sinosoidal for AC and Trapezoidal for BLDC. 7.2 of the manual shows armature plus and minius for DC modes. The other modes are 3 wire except to a 4 wire Stepper '2ph' mode.
The three phase car alternat0r might work in AC mode, because you could independently engergize the rotor field coil, im not to sure about the 3 phase stepper mode since I have not studied it , but perhaps both modes would work.
The manual says in sec 13, AC as permanant magnet type. The implication is that the 3 phase VFD invertor type control found in a Hitachi or similar VFD is not a a part of the Granite function? So a three phase induction squrriel cage type motor would not work?
If phase non magnetic did work, Less likely a 2phase ac (is supposed to be self starting), and using 2 legs of the granite 3phase might have the wrong angular relation of non 90 degrees.
More unlikely?:Single phase AC motors with an Squirrel cage non magnetic rotor require some method of starting rotation and some method change in voltage frequency to incude a speed of rotation. If the granite device can produce the changeing frequecy from say one leg of the AC mode, or a pulsed DC, and it can cooperate with the motors internal starting scheme, (starting winding, with or without capacitor). The single phase invertor induction motor control is not something I have stumbled upon consciously, I should look around.
Repulsion Motors, have strange brushes
Shaded pole small motors, fans n stuff same as single phase induction? or almost a 4 wire stepper?